PU foam based pyramid absorbers 3640

These PU foam based pyramid absorbers are the most popular solution for 3, 5 and 10 m EMC chambers in the market.

Solution for 3, 5 and 10 m EMC chambers in the market

These absorbers are the most popular solution for 3, 5 and 10 m EMC chambers in the market.  Through optimization, this product has a superb performance across 30 MHz to 18 GHz. The foam absorber performs from 30 MHz up to 40GHz and beyond

Prototypes are made and the design is tested. Results become part of a valuable feedback loop for refining our design further.

Broadband Pyramidal Absorber is a low density polyurethane foam, filled with high loss dielectric material in open cell structure and finished with blue paint.

The general base size is 60 cm x 60 cm with 50 mm to 1200 mm height pyramidal. It’s flexible and light weight, can be attached on the wall easily. It is a high performance broadband RF absorber and widely used for Anechoic Chambers.


PU foam based pyramid absorbers
3640-300 (300 mm height PU foam based pyramid absorber)

Characteristics

  • Such absorbers have a pyramid-shaped appearance, with blue color (it can be selected as request)
  • Pliable and flexible, the pyramids won’t bend in long-term use, and its absorbing properties won’t be changed within 10 years.
  • Oxygen index ≥ 29% (GB/T2406-93), which belongs to flame retardant B2 level (GB8624-1997)
  • Good environmental performance, all raw materials can meet the environmental requirements, non volatile, no smell and non-toxic.
  • Working conditions: general indoor application
    • Long-time working temperature: -50 °C ~ 90 °C
      Short-time working temperature: -100 °C ~ 120 °C
    • Relative humidity: 55% ± 15%
      Frequency range: 30 MHz ~ 110 GHz

Installation method

Generally an environmental protective adhesive is used to paste the absorbers on the shield body (inside of the Faraday cage); when the absorbers’ height is below 500 mm, Velcro installation can be applied; furthermore, we can also adopt the fasteners to install the absorbers, which would facilitate the replacement of absorbers and the relocation of chambers.


Schematic diagram of PU foam based microwave absorbers

PU foam based pyramid absorbers technical drawing schematic diagram
Technical drawing of PU foam based pyramid absorbers

Bold items are 98% on stock

Product specification and part numbers

Part number Base size (mm*mm) Pyramid quantity per unit Unit size A*C*B (mm*mm*mm) Standard weight (kg/m2)
3640-50 600 x 600 576 50 x 18.5 x 15 1.5
3640-96 600 x 600 225 96 x 36 x 20 2.2
3640-190 600 x 600 81 190 x 65 x 50 4
3640-300 600 x 600 36 300 x 100 x 60 7
3640-495 600 x 600 16 495 x 145 x 65 11
3640-700 600 x 600 9 700 x 195 x 130 16
3640-1000 300 x 300 1 1000 x 300 x 150 22
3640-1200 400 x 300 1 1200 x 400 x 200 25

Reflection loss / Shielding performance

Part number Reflection loss under
vertical incidence (-dB @ GHz)
Power handling
capacity
0.03 0.08 0.3 0.5 1 3 6 10 18 40 100 kW/m2
3640-50             30 35 40 50 45 1.5
3640-96           30 35 40 45 50 45 1.5
3640-190         27 35 40 45 50 50 48 1.5
3640-300       25 35 40 50 50 50 50 47 1.5
3640-495     20 30 40 45 50 50 50 50 48 1.5
3640-700   8 25 35 40 50 50 50 50 50 48 1.5
3640-1000   11 30 40 45 50 50 50 50 50 47 1.5
3640-1200 5 13 35 40 50 50 50 50 50 50 47 1.5
These values are measured under laboratory conditions.
In your situation results may differ, please read our Guarantee

Please note:

  • For the data below 500 MHz, it is obtained by low-frequency coaxial test method (GJB5239-2004); while for the data above 1 GHz, it is obtained by far-field RCS test method (GJB2038A-2011)
  • The performance data listed in the above table is the guaranteed data, and the measured data would be equal to or better than the guaranteed data.
  • The bold part number is a stock item and can be delivered immediately
  • Certification: CE RoHS

 

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Select an option:
50 : 50 mm
96 : 96 mm
190 : 190 mm
300 : 300 mm
495 : 495 mm
700 : 700 mm
1000 : 1000 mm
1200 : 1200 mm
* Note: The red blocks are required